Possibly redundant once 3.2.1 is out.

merge from 3.2.

constants to be used for STARTUPINFO were exposed due to the change.

before continuing.

This is useful for starting up the test suite to attach a debugger such
as Visual Studio or others.

by Charles-François Natali.

and make it available as `test.support.IPV6_ENABLED`.  Patch by
Charles-François Natali.

Initial patches by Tobias Brink. Thanks!

http://mail.python.org/pipermail/python-checkins/2011-April/104688.html

Thanks!